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We present a systematic study of the diffuse ionized gas (DIG) in M83 and itseffects on the measurement of metallicity gradients at varying resolutionscales. Using spectrophotometric data cubes of M83 obtained at the 2.5m duPonttelescope at Las Campanas Observatory as part of the TYPHOON program, weseparate the HII regions from the DIG using the [SII]/H$\alpha$ ratio, HIIphot(HII finding algorithm) and the H$\alpha$ surface brightness. We find that thecontribution to the overall H$\alpha$ luminosity is approximately equal for theHII and DIG regions. The data is then rebinned to simulate low-resolutionobservations at varying resolution scales from 41 pc up to 1005 pc. Metallicitygradients are measured using five different metallicity diagnostics at eachresolution. We find that all metallicity diagnostics used are affected by theinclusion of DIG to varying degrees. We discuss the reasons of why themetallicity gradients are significantly affected by DIG using the HII dominanceand emission line ratio radial profiles. We find that applying the[SII]/H$\alpha$ cut will provide a closer estimate of the true metallicitygradient up to a resolution of 1005 pc for all metallicity diagnostics used inthis study.

The Effects of Diffuse Ionized Gas and Spatial Resolution on Metallicity Gradients: TYPHOON Two-Dimensional Spectrophotometry of M83